Update fetch_sims for Xcode 10.1.
Update fetch_sims for Xcode 10.1.

If you have Xcode 10.1 installed, _even if Xcode 10.0 is set as the default version of Xcode`, the output from `simctl` has a different format, specifically for availability. The rest of the fields appear to be the same, just not this one.
neonichu/fourflusher,neonichu/fourflusher